139281437 has 2 divisors, whose sum is σ = 139281438. Its totient is φ = 139281436.

The previous prime is 139281421. The next prime is 139281463. The reversal of 139281437 is 734182931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103449241 + 35832196 = 10171^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 139281437 - 2⁴ = 139281421 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139281437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139281487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69640718 + 69640719.

It is an arithmetic number, because the mean of its divisors is an integer number (69640719).

Almost surely, 2^139281437 is an apocalyptic number.

It is an amenable number.

139281437 is a deficient number, since it is larger than the sum of its proper divisors (1).

139281437 is an equidigital number, since it uses as much as digits as its factorization.

139281437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 38.

The square root of 139281437 is about 11801.7556744749. The cubic root of 139281437 is about 518.3595206927.

The spelling of 139281437 in words is "one hundred thirty-nine million, two hundred eighty-one thousand, four hundred thirty-seven".